Line data    Source code

       1             : /*
       2             :     Mosh: the mobile shell
       3             :     Copyright 2012 Keith Winstein
       4             : 
       5             :     This program is free software: you can redistribute it and/or modify
       6             :     it under the terms of the GNU General Public License as published by
       7             :     the Free Software Foundation, either version 3 of the License, or
       8             :     (at your option) any later version.
       9             : 
      10             :     This program is distributed in the hope that it will be useful,
      11             :     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12             :     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13             :     GNU General Public License for more details.
      14             : 
      15             :     You should have received a copy of the GNU General Public License
      16             :     along with this program.  If not, see <http://www.gnu.org/licenses/>.
      17             : 
      18             :     In addition, as a special exception, the copyright holders give
      19             :     permission to link the code of portions of this program with the
      20             :     OpenSSL library under certain conditions as described in each
      21             :     individual source file, and distribute linked combinations including
      22             :     the two.
      23             : 
      24             :     You must obey the GNU General Public License in all respects for all
      25             :     of the code used other than OpenSSL. If you modify file(s) with this
      26             :     exception, you may extend this exception to your version of the
      27             :     file(s), but you are not obligated to do so. If you do not wish to do
      28             :     so, delete this exception statement from your version. If you delete
      29             :     this exception statement from all source files in the program, then
      30             :     also delete it here.
      31             : */
      32             : 
      33             : #include <assert.h>
      34             : #include "terminaluserinput.h"
      35             : 
      36             : using namespace Terminal;
      37             : using std::string;
      38             : 
      39        1181 : string UserInput::input( const Parser::UserByte *act,
      40             :                          bool application_mode_cursor_keys )
      41             : {
      42             :   /* The user will always be in application mode. If stm is not in
      43             :      application mode, convert user's cursor control function to an
      44             :      ANSI cursor control sequence */
      45             : 
      46             :   /* We need to look ahead one byte in the SS3 state to see if
      47             :      the next byte will be A, B, C, or D (cursor control keys). */
      48             : 
      49             :   /* This doesn't handle the 8-bit SS3 C1 control, which would be
      50             :      two octets in UTF-8. Fortunately nobody seems to send this. */
      51             : 
      52        1181 :   switch ( state ) {
      53        1181 :   case Ground:
      54        1181 :     if ( act->c == 0x1b ) { /* ESC */
      55           0 :       state = ESC;
      56             :     }
      57        1181 :     return string( &act->c, 1 );
      58             : 
      59           0 :   case ESC:
      60           0 :     if ( act->c == 'O' ) { /* ESC O = 7-bit SS3 */
      61           0 :       state = SS3;
      62           0 :       return string();
      63             :     }
      64           0 :     state = Ground;
      65           0 :     return string( &act->c, 1 );
      66             : 
      67           0 :   case SS3:
      68           0 :     state = Ground;
      69           0 :     if ( (!application_mode_cursor_keys)
      70           0 :          && (act->c >= 'A')
      71           0 :          && (act->c <= 'D') ) {
      72           0 :       char translated_cursor[ 2 ] = { '[', act->c };
      73           0 :       return string( translated_cursor, 2 );
      74             :     } else {
      75           0 :       char original_cursor[ 2 ] = { 'O', act->c };
      76           0 :       return string( original_cursor, 2 );
      77             :     }
      78             : 
      79           0 :   default:
      80           0 :     assert( !"unexpected state" );
      81             :     state = Ground;
      82             :     return string();
      83             :   }
      84             : }